6 Best Alternatives to the GRAT 75 (2026)

How these alternatives compare

AQUASTRONG Inverter Pool Heat Pump

The AQUASTRONG model offers dual-mode heating and cooling with app control, similar to the GRAT unit. It is designed for larger footprints, measuring 29.3 inches long and 15.8 inches wide. The GRAT 75,000 BTU pump is more compact at 34 inches long but 18 inches wide. AQUASTRONG uses a white finish, while GRAT features gray UV-resistant ABS housing. Both units use inverter technology for efficiency. You should choose AQUASTRONG if you need a wider base for stability or prefer a white aesthetic. The GRAT remains better for tight spaces due to its narrower 18-inch width. Both support 2.4GHz WiFi for remote monitoring.

MICOE 35,000 BTU Inverter Pool Heat Pump

The MICOE 35,000 BTU unit is significantly smaller than the GRAT 75,000 BTU model. It has a lower heating capacity, making it suitable for smaller pools. The MICOE is black and measures 36.4 inches long, which is longer than the GRAT. However, it is narrower at 14.3 inches wide compared to GRAT’s 18 inches. Both units provide app control and inverter efficiency. MICOE includes cooling capabilities, matching GRAT’s dual-mode function. You should pick MICOE if your pool volume is under 10,000 gallons. The GRAT is better for large pools up to 21,000 gallons. MICOE’s lower BTU output means slower heating but potentially lower energy use for smaller volumes.

Varpoolfaye 40000 BTU Pool Heat Pump

The Varpoolfaye 40,000 BTU heat pump operates on 220V, which differs from standard 110V units like the GRAT. It is designed for pools up to 12,000 gallons, smaller than GRAT’s 21,000-gallon capacity. The Varpoolfaye is silver and measures 35 inches long, slightly longer than GRAT’s 34 inches. It shares the app control feature and dual-mode heating and cooling. You should choose Varpoolfaye if you have a 220V electrical setup and a medium-sized pool. The GRAT is better for larger pools or standard 110V outlets. Both use inverter technology. Varpoolfaye’s lower capacity makes it less suitable for large above-ground pools, whereas GRAT handles them efficiently.

Pentair SuperFlo VS 1.5 HP Variable Speed Pump

The Pentair SuperFlo VS is a variable speed pump, not a heat pump. It does not heat or cool water like the GRAT unit. Instead, it circulates water with adjustable speeds to save energy. It weighs 25.8 pounds and measures 28 inches long. The GRAT is a dedicated heating and cooling device with 75,000 BTU capacity. Pentair lacks app control, relying on local automation systems. You should pick Pentair if you already have a heater and need efficient circulation. The GRAT is the choice if you need temperature regulation. Pentair fits inground pools with automation, while GRAT works with both inground and above-ground pools via app.

NATURAQUELL 55,000 BTU Inverter Pool Heat Pump

The NATURAQUELL 55,000 BTU heat pump has lower heating capacity than the GRAT 75,000 BTU model. It is designed for pools up to 16,000 gallons, smaller than GRAT’s 21,000-gallon limit. NATURAQUELL is stealth black and measures 25.3 inches long, shorter than GRAT’s 34 inches. It offers app control and inverter efficiency, matching GRAT’s smart features. You should choose NATURAQUELL if you have a medium-sized pool and prefer a shorter unit. The GRAT provides more heating power for larger volumes. Both units support dual-mode operation. NATURAQUELL’s lower BTU output may result in slower heating times for large pools compared to the GRAT.

Vidapool VTX016 Inverter Heat Pump

The Vidapool VTX016 is designed for small pools up to 9,100 gallons, much smaller than GRAT’s 21,000-gallon capacity. It has lower heating capacity than the GRAT 75,000 BTU model. Vidapool is metal black and measures 33.8 inches long, slightly shorter than GRAT. It includes app control and cooling capabilities, similar to GRAT. You should pick Vidapool if you have a small pool and need compact dimensions. The GRAT is better for large pools. Both use inverter technology for efficiency. Vidapool’s limited capacity makes it unsuitable for large above-ground pools. GRAT handles larger volumes with its higher BTU output and broader temperature range.

Quick picks

Our 7 picks

1 Best overall

GRAT 75,000 BTU Full Inverter Pool Heat Pump

Best for: large pools up to 21,000 gallons

Heating Capacity

75,000 BTU

Pool Capacity

21,000 Gallons

Compressor Technology

Full Inverter

Operational Modes

Heating & Cooling

Connectivity

WiFi, Bluetooth

Control Type

App Control

View on Amazon: GRAT 75,000 BTU Full Inverter Pool Heat Pump Affiliate link

This GRAT heat pump delivers 75,000 BTU for pools up to 21,000 gallons. It uses full inverter technology for efficient heating and cooling. You can control it via a WiFi app or Bluetooth. The titanium heat exchanger resists corrosion in saltwater. It operates quietly at 50 dB and includes automatic defrost. This unit suits owners of larger pools who want smart control and energy savings.

Pros

• 75,000 BTU heating capacity for pools up to 21,000 gallons
• Full inverter compressor technology for energy efficiency
• WiFi and Bluetooth app control with remote monitoring
• Titanium heat exchanger for saltwater pool compatibility
• Quiet operation at approximately 50 dB

Cons

• Requires 2.4GHz WiFi for remote app features
• Bluetooth needed only for initial pairing
• Heating range limited to 46°F–104°F

Good fit if

• You have a pool up to 21,000 gallons
• You want smart app control for your heater
• You need a unit for saltwater pools

Skip if

• You have a pool larger than 21,000 gallons
• You need heating below 46°F
• You prefer gas heating over electric heat pumps

Verdict: GRAT 75k BTU Inverter Heat Pump fits large pool owners who want smart control and efficient heating. It handles saltwater well and runs quietly. This unit is a solid choice for those prioritizing capacity and app management.

2 Best budget

AQUASTRONG Inverter Pool Heat Pump

Best for: Energy-efficient dual-mode pool temperature control

Heating Capacity

22,000 BTU

Voltage

120V

Compressor Technology

Full DC variable frequency

Operational Modes

Heating and cooling

COP Rating

15.8

Connectivity

Wi-Fi, app control

View on Amazon: AQUASTRONG Inverter Pool Heat Pump Affiliate link

This AQUASTRONG heat pump uses full DC variable frequency technology to reach a COP rating of 15.8. It offers both heating up to 104°F and cooling down to 47°F. You can control it via an app or the panel. The unit measures 14'x17'x48" and includes adapters for easy connection. It is designed for above-ground and inground pools, providing a quiet operation at 48 dB.

Pros

• High 15.8 COP rating for energy efficiency
• App control for remote temperature adjustments
• Dual-mode heating and cooling operation
• Quiet 48 dB operational noise level

Cons

• Larger footprint than compact competitors
• Heating range starts at 47°F, not lower
• No physical remote control mentioned in data

Good fit if

• You want app-based scheduling and monitoring
• You need both heating and cooling modes
• You prioritize high energy efficiency ratings

Skip if

• You require a compact unit under 14 feet
• You need heating below 47°F capability
• You prefer a unit with a physical remote

Verdict: AQUASTRONG 14'x17'x48" Pool Heat Pump delivers high efficiency and smart control for pool owners who need flexible temperature management. It is ideal for those who value app connectivity and dual-mode performance over compact size.

3 Also great

MICOE 35,000 BTU Inverter Pool Heat Pump

Best for: small pools needing heating and cooling

Heating Capacity

35,000 BTU

Pool Capacity

12,000 gallons

Compressor Technology

Full DC Inverter

Operational Modes

Heating, Cooling, Auto, Boost, ECO

COP Rating

5.95

Connectivity

App

View on Amazon: MICOE 35,000 BTU Inverter Pool Heat Pump Affiliate link

The MICOE 35,000 BTU heat pump serves pools up to 12,000 gallons. Its full DC inverter delivers a COP of 5.95, adjusting output to save energy. You can control it via the app or panel, switching between heating, cooling, and auto modes. It operates in ambient temperatures from 32°F to 109°F. This unit suits those who want precise temperature management for their pool.

Pros

• Full DC inverter technology for up to 69% energy savings
• Dual heating and cooling modes with 5 operational settings
• App control for remote temperature and schedule adjustments
• Titanium heat exchanger for corrosion resistance

Cons

• Smaller pool capacity than competitors supporting 16,000 gallons
• Heating range stops at 104°F, limiting high-heat options
• Requires professional electrician installation for safety

Good fit if

• You need reliable cooling down to 82°F in summer
• You want app-based scheduling and remote monitoring
• Your pool size is under 12,000 gallons

Skip if

• You have a pool larger than 12,000 gallons
• You prefer a unit with a maximum temperature above 104°F
• You are uncomfortable hiring a professional for installation

Verdict: The MICOE 35,000 BTU Inverter Pool Heat Pump fits users with smaller pools who value app control and cooling capabilities. Its inverter efficiency makes it a practical option for year-round temperature management.

4 Also great

Varpoolfaye 40000 BTU Pool Heat Pump

Best for: smaller pools needing heating and cooling

Heating Capacity

40000 BTU

Pool Capacity

12000 Gallons

Voltage

220V

Operational Modes

Heating and Cooling

COP Rating

6.2

Connectivity

WiFi App Control

View on Amazon: Varpoolfaye 40000 BTU Pool Heat Pump Affiliate link

The Varpoolfaye 40000 BTU heat pump delivers a COP of 6.2 for efficient heating and cooling. It supports pools up to 12000 gallons and features WiFi app control. The unit operates in heating mode from 59°F to 104°F and cooling mode from 45°F to 86°F. A titanium heat exchanger ensures durability in freshwater or saltwater pools. This 220V model is designed for above-ground and inground setups.

Pros

• High COP of 6.2 for energy efficiency
• Dual heating and cooling operational modes
• WiFi app control for remote adjustments
• Titanium heat exchanger resists corrosion

Cons

• Limited to pools up to 12000 gallons
• Requires 220V electrical connection
• Operates at 53 dB noise level

Good fit if

• You need both heating and cooling functions
• You want remote control via a smartphone app
• You have a pool under 12000 gallons

Skip if

• You only have 110V power available
• Your pool holds more than 12000 gallons
• You prefer silent operation under 50 dB

Verdict: The Varpoolfaye 40000 BTU 220V Heat Pump fits users who need a dual-mode unit with app control for smaller pools. It offers strong efficiency but requires specific electrical and size constraints.

5 Best variable speed

Pentair SuperFlo VS 1.5 HP Variable Speed Pump

Best for: energy-efficient inground pool circulation

Voltage

115V to 230V

Connectivity

RS-485

Use

Poolside, Inground Pools

Speed

Variable Speed

Horsepower

1.5 HP

Dimensions

28 × 15.5 × 12.5 inches

View on Amazon: Pentair SuperFlo VS 1.5 HP Variable Speed Pump Affiliate link

This Pentair SuperFlo VS is a variable speed pool pump rated at 1.5 HP. It features a totally enclosed fan cooled motor and a digital control keypad with three programmable speeds. The unit supports universal power compatibility from 115V to 230V. It connects via RS-485 for automation systems. This pump suits inground pools where energy efficiency and precise flow control are priorities.

Pros

• Variable speed technology adjusts pump speed to match pool needs
• Totally enclosed fan cooled motor design enhances durability
• Digital keypad offers three programmable speeds and a 24-hour clock
• Works with 115V to 230V power without special wiring

Cons

• No mobile app or WiFi control mentioned in specifications
• Requires RS-485 automation system for smart connectivity
• Lacks a remote control for manual operation

Good fit if

• You need a variable speed pump for energy savings
• You have an inground pool with automation systems
• You prefer a durable TEFC motor design

Skip if

• You want direct WiFi app control
• You only have a 115V outlet and need a dedicated 115V model
• You prefer a simpler non-digital interface

Verdict: Pentair SuperFlo VS 1.5 HP is a solid choice for homeowners with automation systems who prioritize energy efficiency. It fits inground pools where precise speed control matters more than remote app access.

6 Best premium

NATURAQUELL 55,000 BTU Inverter Pool Heat Pump

Best for: medium pools up to 16,000 gallons

Heating Capacity

55,000 BTU

Pool Capacity

Up to 16,000 gallons

Operational Modes

Heating and Cooling

COP Rating

16.00

Connectivity

Wi-Fi app control

Use

Poolside, Inground Pools

View on Amazon: NATURAQUELL 55,000 BTU Inverter Pool Heat Pump Affiliate link

This NATURAQUELL heat pump handles pools up to 16,000 gallons. It uses a full inverter compressor to maintain steady water temperatures between 5°F and 104°F. You get both heating and cooling modes with a COP rating of up to 16.00. The unit connects via WiFi to the Smart Life app or its touch panel. It is designed for quiet outdoor operation at 52 dB(A).

Pros

• Full inverter compressor for stable temperature control
• Heats and cools pools up to 16,000 gallons
• Smart Life app and WiFi connectivity
• 55,000 BTU/h heating capacity
• Quiet 52 dB(A) operation

Cons

• Large footprint at 16x32x66 inches
• No remote control included
• Limited to 11 size variations

Good fit if

• You need a heat pump for pools up to 16,000 gallons
• You want both heating and cooling capabilities
• You prefer app-based temperature management

Skip if

• You have a pool larger than 16,000 gallons
• You require a compact unit under 16 feet in length
• You need a system without WiFi dependency

Verdict: NATURAQUELL 55,000 BTU Inverter Heat Pump fits users with medium-sized pools who value steady temperature regulation and app control over compact size.

7 Also great

Vidapool VTX016 Inverter Heat Pump

Best for: small pools needing cooling and app control

Heating Capacity

35000BTU

Pool Capacity

9100 Gallons

Voltage

220V

Compressor Technology

Intelligent Inverter

Operational Modes

Heating & Cooling

COP Rating

12

View on Amazon: Vidapool VTX016 Inverter Heat Pump Affiliate link

This Vidapool heat pump uses inverter technology to heat or cool pools up to 9,100 gallons. It connects via WiFi and an app for remote scheduling. The unit operates quietly at 32 dB and switches between heating and cooling modes. Its dimensions are 33.8 by 25.4 by 15.1 inches. It fits above-ground and in-ground pools with standard adapters.

Pros

• Inverter compressor adjusts power for energy savings
• WiFi app control for remote temperature management
• Heating and cooling operational modes
• Quiet 32 dB operation

Cons

• 9,100-gallon capacity is smaller than many competitors
• Large physical footprint requires ample space
• No remote control hardware included

Good fit if

• You need a unit that can also cool water
• You want to control temperature via smartphone
• Your pool holds up to 9,100 gallons

Skip if

• You have a pool larger than 9,100 gallons
• You require a physical handheld remote
• You need a compact unit for tight spaces

Verdict: Vidapool VTX016 9100 Gallon Inverter Heat Pump suits owners of smaller pools who value app control and cooling capability. Its inverter system offers efficiency, but the limited capacity and size restrict its use.

Specifications side by side

Frequently asked questions

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